WheelColorPickerState class Null safety

A button which you can click to pop out an overlay containing a wheel of color pieces.

Mixed in types




color Color
current color of the button
read / write
context BuildContext
The location in the tree where this widget builds.
read-only, inherited
fanSliceList List<FanSlice>
List of fan pieces generated on initialization with respect to colors
read / write
hashCode int
The hash code for this object.
read-only, inherited
isOpen bool
When the overlay is shown, isOpen is true We can technically only rely on overlayEntry to determine if the overlay is shown; however, we want to show the animation of fan slices disappearing, thus the removal of overlayEntry is a future. Thus to prevent user from double tapping another color before the overlay disappears, we have to check isOpen.
read / write
mounted bool
Whether this State object is currently in a tree.
read-only, inherited
overlayContent Widget
Overlay content is generated post build The reason for this is because we need the trigger button's location information in-order to determine the center position for our wheel Also this saves unnecessary computation
read / write
overlayEntry OverlayEntry?
current overlayEntry to remove the overlay, we can do overlayEntry.remove() which will remove its self from OverlayState The content of the overlayEntry is generated
read / write
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
widget WheelColorPicker
The current configuration.
read-only, inherited


activate() → void
Called when this object is reinserted into the tree after having been removed via deactivate.
build(BuildContext context) Widget
Describes the part of the user interface represented by this widget.
createTicker(TickerCallback onTick) Ticker
Creates a ticker with the given callback.
deactivate() → void
Called when this object is removed from the tree.
@mustCallSuper, @protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
didChangeAccessibilityFeatures() → void
Called when the system changes the set of currently active accessibility features.
didChangeAppLifecycleState(AppLifecycleState state) → void
Called when the system puts the app in the background or returns the app to the foreground.
didChangeDependencies() → void
Called when a dependency of this State object changes.
@mustCallSuper, @protected, inherited
didChangeLocales(List<Locale>? locales) → void
Called when the system tells the app that the user's locale has changed. For example, if the user changes the system language settings.
didChangeMetrics() → void
Called when the application's dimensions change. For example, when a phone is rotated.
didChangePlatformBrightness() → void
Called when the platform brightness changes.
didChangeTextScaleFactor() → void
Called when the platform's text scale factor changes.
didHaveMemoryPressure() → void
Called when the system is running low on memory.
didPopRoute() Future<bool>
Called when the system tells the app to pop the current route. For example, on Android, this is called when the user presses the back button.
didPushRoute(String route) Future<bool>
Called when the host tells the application to push a new route onto the navigator.
didPushRouteInformation(RouteInformation routeInformation) Future<bool>
Called when the host tells the application to push a new RouteInformation and a restoration state onto the router.
didUpdateWidget(covariant WheelColorPicker oldWidget) → void
Called whenever the widget configuration changes.
@mustCallSuper, @protected, inherited
dispose() → void
Called when this object is removed from the tree permanently.
initState() → void
Called when this object is inserted into the tree.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
reassemble() → void
Called whenever the application is reassembled during debugging, for example during hot reload.
@mustCallSuper, @protected, inherited
setState(VoidCallback fn) → void
Notify the framework that the internal state of this object has changed.
@protected, inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) String
A string representation of this object.
toStringShort() String
A brief description of this object, usually just the runtimeType and the hashCode.


operator ==(Object other) bool
The equality operator.